Describe three differences between the two blood vessels pictured opposite.
Explain why each difference exists.
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Epinephrine is a hormone released from the adrenal gland of the body, most often in a stressful situation. it is known as the "fight-or-flight" hormone. one way that it causes a response in the body is to activate receptors on muscle cells. where are these cellular receptors located? a. on the cell membrane b. in the nucleus c. on the cell wall d. around the mitochondria

Are the earth's ocean floor and continents the same age geologically? why or why not?

What's the waste product of electrons and pyruvate combining in fermentation?